CN206559675U - A kind of LED dimming driving circuits - Google Patents
A kind of LED dimming driving circuits Download PDFInfo
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- CN206559675U CN206559675U CN201621435650.XU CN201621435650U CN206559675U CN 206559675 U CN206559675 U CN 206559675U CN 201621435650 U CN201621435650 U CN 201621435650U CN 206559675 U CN206559675 U CN 206559675U
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Abstract
The utility model discloses a kind of LED dimming driving circuits, including：RCC constant-current drive circuits, OVP backfeed loops and current acquisition backfeed loop；When output no-load, OVP backfeed loops are compared the output voltage of RCC constant-current drive circuits with a reference voltage；When the output voltage of RCC constant-current drive circuits is more than reference voltage, the starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by OVP backfeed loops by conducting state so that the output voltage reduction of RCC constant-current drive circuits；When output no-load connects load, the output current of current acquisition backfeed loop collection RCC constant-current drive circuits is simultaneously compared with a reference current；When the output current of RCC constant-current drive circuits is more than reference current, the starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by current acquisition backfeed loop by conducting state so that the output current reduction of RCC constant-current drive circuits.
Description
Technical field
The utility model is related to a kind of electronic circuit of lighting apparatus, specifically a kind of dimming driving circuit for LED.
Background technology
With technological progress, the advantage of LED/light source in illumination applications is gradually highlighted, on the one hand, its light efficiency, colour rendering
Conventional light source such as incandescent lamp, gas discharge fluorescent lamp can be met or exceeded, on the other hand, its adjustability is relatively passed
System light source has bigger development space, is particularly suitable for use in the general illumination fields such as modern house, business.
But the light fixture that LED/light source is realized also has its obvious defect, it is contemplated that LED/light source output semiconductor device,
Its driving power supply usually requires low pressure, so, LED lamp can all carry corresponding driver.This quasi-driver is often using opening
The power supply of pass mode, such as comprising switch transformer, oscillating circuit, protection circuit, it is contemplated that dimming function, precision and life-span
The problems such as, what is had even applies to IC.The general character of this kind of circuit is that circuit is more complicated, and cost is higher, especially in middle low-power LED
It is difficult to promote the use of on desk lamp with dimmer switch.
Utility model content
Technical problem underlying to be solved in the utility model is to provide a kind of LED dimming driving circuits, and cost is low, reliable
Property high, compatibility it is good.
In order to solve above-mentioned technical problem, the utility model provides a kind of LED dimming driving circuits, it is characterised in that
Including：RCC constant-current drive circuits, OVP backfeed loops and current acquisition backfeed loop；
When output no-load, current acquisition backfeed loop does not work, and the OVP backfeed loops are by RCC constant-current drive circuits
Output voltage compared with a reference voltage；When the output voltage of RCC constant-current drive circuits is more than reference voltage, the OVP
Starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by backfeed loop by conducting state so that RCC constant currents
The output voltage reduction of drive circuit；
When output no-load connects load, the output voltage of RCC constant-current drive circuits is consistently less than OVP reference voltage,
The OVP backfeed loops do not work, the output current of current acquisition backfeed loop collection RCC constant-current drive circuits and with one
Reference current compares；When the output current of RCC constant-current drive circuits is more than reference current, the current acquisition backfeed loop will
Starting switch pipe Q1 in RCC constant-current drive circuits switches to cut-off state by conducting state so that RCC constant-current drive circuits
Output current is reduced.
In a preferred embodiment：OVP backfeed loops include a comparator A1, and the connection of its electrode input end is described with reference to electricity
Pressure, negative input is connected to resistance R2, R6 of series connection common port；Described resistance R2, R6 are connected in parallel on RCC constant-current drive circuits
Positive pole, between cathode output end；The output end of the comparator A1 is connected to switching tube Q4 base stage, switching tube Q4 transmitting
Pole is grounded, and colelctor electrode is connected to switching tube Q2 base stage；The grounded emitter of the switching tube Q2, colelctor electrode is connected to described open
Dynamic switching tube Q1 base stage.
In a preferred embodiment：The current acquisition backfeed loop includes comparator A2, its electrode input end connection institute
Reference current is stated, negative pole gathers the output current of RCC constant-current drive circuits by resistance LB1；The output end of the comparator A2
It is connected with comparator A1 output end.
In a preferred embodiment：The RCC constant-current drive circuits include a mutual inductor, the one of its input coil T1A
Individual input is connected to the cathode output end of current rectifying and wave filtering circuit, and another input is connected to the collection of the starting switch pipe Q1
Electrode；The base stage of starting switch pipe is connected to the cathode output end of current rectifying and wave filtering circuit by a decompression network；Separately there is an auxiliary
Coil T1B, one end of the ancillary coil is connected in the decompression network by an oscillating capacitance C5；The oscillating capacitance it is another
One end is connected to starting switch pipe Q1 base stage.
In a preferred embodiment：The output winding T1C of the mutual inductor two output ends are respectively the RCC permanent
Flow the cathode output end and cathode output end of drive circuit.
In a preferred embodiment：The current rectifying and wave filtering circuit includes a bridge rectifier, and it has connection alternating current
Input, and the DC terminal with positive pole and negative pole；And a filter capacitor C2, it is connected to the positive pole and negative DC end
Between.
In a preferred embodiment：Also include freewheeling circuit, the freewheeling circuit is connected to the positive pole and negative DC end
Between, include a resistance R3 and an electric capacity C3 for series connection.
In a preferred embodiment：The decompression network is resistance R4, R5, the R7 being connected in series.
In a preferred embodiment：The cathode output end of the output winding T1C is connected in series the resistance LB1.
Compared to prior art, the technical solution of the utility model possesses following beneficial effect：
1. a kind of LED dimming driving circuits that the utility model is provided, OVP voltages are directly from RCC constant-current drive circuits
Output end is gathered, and feeds back to ratio amplifier, it is closer that bringing onto load output voltage and floating voltage difference can be done, and is greatly reduced defeated
Go out the electric stress of device, and no-load power consumption can be made small；
2. a kind of LED dimming driving circuits that the utility model is provided, negative-feedback amplifier is sent to after output current sampling
Device, is adjusted by switching tube Q4, and high-precision output current control can be achieved, is not influenceed by input voltage, solves biography
The RCC circuits of system cause the problem of corresponding power output also increases because of the increase of input voltage；
3. after output end adds comparator A1 and A2, can constant output voltage and electric current, line regulation can be accomplished
Within 3%；Compare with common light modulation IC, cost is lower, can be widely popularized and use in LED illumination.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model preferred embodiment.
Embodiment
The utility model is described further below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1, a kind of LED dimming driving circuits, it is characterised in that including：RCC constant-current drive circuits, OVP are fed back to
Road and current acquisition backfeed loop；
When output no-load, current acquisition backfeed loop does not work, and the OVP backfeed loops are by RCC constant-current drive circuits
Output voltage compared with a reference voltage；When the output voltage of RCC constant-current drive circuits is more than reference voltage, the OVP
Starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by backfeed loop by conducting state so that RCC constant currents
The output voltage reduction of drive circuit；
When output no-load connects load, the output voltage of RCC constant-current drive circuits is consistently less than OVP reference voltage,
The OVP backfeed loops do not work, the output current of current acquisition backfeed loop collection RCC constant-current drive circuits and with one
Reference current compares；When the output current of RCC constant-current drive circuits is more than reference current, the current acquisition backfeed loop will
Starting switch pipe Q1 in RCC constant-current drive circuits switches to cut-off state by conducting state so that RCC constant-current drive circuits
Output current is reduced.
Particular circuit configurations are as follows：OVP backfeed loops include a comparator A1, and the connection of its electrode input end is described with reference to electricity
Pressure, negative input is connected to resistance R2, R6 of series connection common port；Described resistance R2, R6 are connected in parallel on RCC constant-current drive circuits
Positive pole, between cathode output end；The output end of the comparator A1 is connected to switching tube Q4 base stage, switching tube Q4 transmitting
Pole is grounded, and colelctor electrode is connected to switching tube Q2 base stage；The grounded emitter of the switching tube Q2, colelctor electrode is connected to described open
Dynamic switching tube Q1 base stage.
The current acquisition backfeed loop includes comparator A2, and its electrode input end connects the reference current, and negative pole leads to
Cross the output current that resistance LB1 gathers RCC constant-current drive circuits；The output end of the comparator A2 and comparator A1 output end
Connection.
The RCC constant-current drive circuits include a mutual inductor, and its an input coil T1A input is connected to rectification
The cathode output end of filter circuit, another input is connected to the colelctor electrode of the starting switch pipe Q1；Starting switch pipe
Base stage is connected to the cathode output end of current rectifying and wave filtering circuit by a decompression network, and the decompression network is the resistance being connected in series
R4、R5、R7.Separately there is an ancillary coil T1B, one end of the ancillary coil is connected to the decompression network by an oscillating capacitance C5
In；The other end of the oscillating capacitance is connected to starting switch pipe Q1 base stage.
The output winding T1C of the mutual inductor two output ends are respectively the positive pole of the RCC constant-current drive circuits
Output end and cathode output end.The cathode output end of the output winding T1C is connected in series the resistance LB1.
The current rectifying and wave filtering circuit includes a bridge rectifier, and it has the input of connection alternating current, and with positive pole
With the DC terminal of negative pole；And a filter capacitor C2, it is connected between the positive pole and negative DC end.
Also include freewheeling circuit, the freewheeling circuit is connected between the positive pole and negative DC end, includes the one of series connection
A resistance R3 and electric capacity C3；Its role is to when light modulator is adjusted to low side, provides bigger electric current to controllable silicon and maintain, make
It continues to conducting state, to improve because of the low side stroboscopic problem that load current is too small and produces.
The course of work is as described below：Filtered out by filter circuit and bridge rectifier electricity is delivered to after AC network electromagnetic interference signal
Road, pulsating dc voltage is changed into by alternating voltage, and pulsating dc voltage reaches start-up circuit after electric capacity C2 is filtered after filtering, given
After the charging of C5 electric capacity, starting switch pipe Q1 is opened.The voltage of ancillary coil T1B sensings maintains starting switch pipe Q1 further to lead
It is logical, and quickly enter saturation conduction；With the reduction of ancillary coil T1B current changing rates so that the drive of starting switch pipe Q1 base stages
Kinetic force declines, and starting switch pipe Q1 will be forced to enter amplification region from saturation conduction, when the driving of starting switch pipe Q1 base stages
Ability further declines, and starting switch pipe Q1 will quickly enter cut-off region and turn off.
After the energy on output winding T1C is all discharged by LED load, start circuit and charged again to C5 so that opening
Dynamic bis- conductings of switching tube Q1.So loop cycle realizes that line switching works.
Hereafter, when output no-load, output current is zero, and comparator A2 does not collect the output of RCC crossing current drive circuits
Electric current is without working；Due to it is no load light emitting diode carry out clamper, RCC crossing current drive circuit output voltage it is linear on
Rise, when output voltage reaches setting value (R2+R6) xVO/R2>During V_ref, comparator A1 outputs low level → cause switching tube Q4
Starting switch pipe Q1 base current → cause starting switch pipe Q1 ends to cause major loop is taken in cut-off → switching tube Q2 conducting away
Shut-off → so as to reduce RCC crossing current drive circuit output voltages；As { (R2+R6) * VO }/R2<During V_ref, comparator A1 outputs
High level driving switch pipe Q4 conductings → switching tube Q2 base voltages drag down and end → switching tube Q1 conductings, thus cycle friendship
Replace, constant floating voltage OVP.
When output connects load, because output voltage is less than OVP voltages, comparator A1 does not work, and comparator A2 passes through
Resistance LB1 gathers the output current of RCC constant-current drive circuits, when the output current of RCC constant-current drive circuits>V_SENSE*V_
Ref/ { during (V_SENSE+V_ref) * RS1, take away by comparator A2 outputs low level → switching tube Q4 cut-offs → switching tube Q2 conductings
The cut-off of starting switch pipe Q1 base current → starting switch pipe Q1 causes major loop shut-off → so as to reducing output current, week
Renew, play the effect of constant output current.
It is described above, only the utility model preferably embodiment, but design concept of the present utility model is not
This is confined to, any one skilled in the art utilizes this design in the technical scope that the utility model is disclosed
The change of unsubstantiality is carried out to the utility model, belongs to invade the behavior of the utility model protection domain.
Claims (9)
1. a kind of LED dimming driving circuits, it is characterised in that including：RCC constant-current drive circuits, OVP backfeed loops and electric current are adopted
Collect backfeed loop；
When output no-load, current acquisition backfeed loop does not work, and the OVP backfeed loops are by the defeated of RCC constant-current drive circuits
Go out voltage with a reference voltage to be compared；When the output voltage of RCC constant-current drive circuits is more than reference voltage, the OVP feedbacks
Starting switch pipe Q1 in RCC constant-current drive circuits is switched to cut-off state by loop by conducting state so that RCC constant currents drive
The output voltage reduction of circuit；
When output no-load connects load, the output voltage of RCC constant-current drive circuits is consistently less than OVP reference voltage, described
OVP backfeed loops are not worked, and the output current of the current acquisition backfeed loop collection RCC constant-current drive circuits is simultaneously referred to one
Electric current compares；When the output current of RCC constant-current drive circuits is more than reference current, the current acquisition backfeed loop is by RCC
Starting switch pipe Q1 in constant-current drive circuit switches to cut-off state by conducting state so that RCC constant-current drive circuits it is defeated
Go out current reduction.
2. a kind of LED dimming driving circuits according to claim 1, it is characterised in that：OVP backfeed loops compare including one
Device A1, its electrode input end connects the reference voltage, and negative input is connected to resistance R2, R6 of series connection common port；Institute
Resistance R2, R6 is stated to be connected in parallel between the positive pole of RCC constant-current drive circuits, cathode output end；The output end of the comparator A1 connects
Switching tube Q4 base stage, switching tube Q4 grounded emitter are connected to, colelctor electrode is connected to switching tube Q2 base stage；The switching tube
Q2 grounded emitter, colelctor electrode is connected to the base stage of the starting switch pipe Q1.
3. a kind of LED dimming driving circuits according to claim 2, it is characterised in that：The current acquisition backfeed loop
Including comparator A2, its electrode input end connects the reference current, and negative pole gathers RCC constant-current drive circuits by resistance LB1
Output current；The output end of the comparator A2 is connected with comparator A1 output end.
4. a kind of LED dimming driving circuits according to claim 3, it is characterised in that：The RCC constant-current drive circuits bag
A mutual inductor is included, its an input coil T1A input is connected to the cathode output end of current rectifying and wave filtering circuit, and another is defeated
Enter the colelctor electrode that end is connected to the starting switch pipe Q1；The base stage of starting switch pipe is connected to rectification by a decompression network and filtered
The cathode output end of wave circuit；Separately there is an ancillary coil T1B, one end of the ancillary coil is connected to institute by an oscillating capacitance C5
State in decompression network；The other end of the oscillating capacitance is connected to starting switch pipe Q1 base stage.
5. a kind of LED dimming driving circuits according to claim 4, it is characterised in that：The output line of the mutual inductor
Circle T1C two output ends are respectively the cathode output end and cathode output end of the RCC constant-current drive circuits.
6. a kind of LED dimming driving circuits according to claim 5, it is characterised in that：The current rectifying and wave filtering circuit includes
One bridge rectifier, it has the input of connection alternating current, and the DC terminal with positive pole and negative pole；And a filter capacitor
C2, it is connected between the positive pole and negative DC end.
7. a kind of LED dimming driving circuits according to claim 6, it is characterised in that：Also include freewheeling circuit, the afterflow
Circuit is connected between the positive pole and negative DC end, includes a resistance R3 and an electric capacity C3 for series connection.
8. a kind of LED dimming driving circuits according to claim 7, it is characterised in that：The decompression network connects for series connection
Resistance R4, R5, the R7 connect.
9. a kind of LED dimming driving circuits according to claim 7, it is characterised in that：The negative pole of the output winding T1C
Output end is connected in series the resistance LB1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621435650.XU CN206559675U (en) | 2016-12-26 | 2016-12-26 | A kind of LED dimming driving circuits |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621435650.XU CN206559675U (en) | 2016-12-26 | 2016-12-26 | A kind of LED dimming driving circuits |
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| CN206559675U true CN206559675U (en) | 2017-10-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108243529A (en) * | 2016-12-26 | 2018-07-03 | 厦门通士达照明有限公司 | A kind of LED dimming driving circuits |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108243529A (en) * | 2016-12-26 | 2018-07-03 | 厦门通士达照明有限公司 | A kind of LED dimming driving circuits |
| CN108243529B (en) * | 2016-12-26 | 2024-05-03 | 厦门通士达照明有限公司 | LED dimming driving circuit |
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Granted publication date: 20171013 Termination date: 20201226 |
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